Coleraine rower Alan Campbell prepares for fourth Olympic appearance

Coleraine rower Alan Campbell prepares to compete in his fourth Olympic Games in Rio, having previously taken part in Athens, Beijing and London.

The London 2012 bronze medallist hopes to be one of the six competitors who will reach the final of the single sculls in Brazil.

Campbell, who will again represent Great Britain, is likely to retire from the sport of he makes the 'A' final on 13 August.